Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 657 [Rate centres in NPA 657] [Dial plan for NPA 657]

NXX: 577

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
657-577 A Fullerton CA LSANCAJWIMD  965H FRACTEL, LLC 730      
657-577 0 Fullerton CA LSANCAJWDS9  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 730   2020-09-09   
657-577 1 Fullerton CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2021-08-13   
657-577 2 Fullerton CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2021-08-13   
657-577 3 Fullerton CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2021-08-13   
657-577 4 Fullerton CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2021-08-13   
657-577 6 Fullerton CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2020-11-02   
657-577 7 Fullerton CA LSANCAJWIMD  965H FRACTEL, LLC 730   2020-07-27   
657-577 8 Fullerton CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2020-11-02   
657-577 9 Fullerton CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2020-07-28   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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